#337BB1#337BB1

#337BB1 is a mid, moderate cyan. Relative luminance 0.180; OKLCH L 56.3% C 0.110 H 244.4°. Best body text is #000000 at 4.61:1 contrast (WCAG AA passes).

Color values

HEX	#337BB1
RGB	rgb(51, 123, 177)
HSL	hsl(206, 55%, 45%)
HSV	hsv(206, 71%, 69%)
CMYK	cmyk(71.2%, 30.5%, 0%, 30.6%)
CIE-LAB	lab(49.55, -4.28, -35.08)
CIE-LCH	lch(49.55, 35.34, 263.04°)
OKLab	oklab(56.26% -0.0476 -0.0992)
OKLCH	oklch(56.26% 0.11 244.4)
XYZ	xyz(16.3810, 18.0422, 44.2056)
Luminance	0.1804 (WCAG relative)
Temperature	cool
Family	cyan

Closest named colors

Perceptual scales

Shades

Tints

Tones

OKLCH scale

Color harmonies

complementary

#337BB1 #B16933

analogous

#33B1A8 #337BB1 #333CB1

triadic

#337BB1 #B1337B #7BB133

tetradic

#337BB1 #A833B1 #B16933 #3CB133

square

#337BB1 #A833B1 #B16933 #3CB133

split-complementary

#337BB1 #B1333C #B1A833

monochromatic

#183952 #255A81 #337BB1 #5499CE #83B6DB

Accessibility & contrast

On white

4.56

#337BB1 on #FFFFFF

AA ✓AA large ✓AAA ✗

On black

4.61

#337BB1 on #000000

AA ✓AA large ✓AAA ✗

Best text color

#000000 on #337BB1

4.61:1 — WCAG AA (normal text) passes

Contrast matrix

fg \ bg	##337BB1	#FFFFFF	#000000	##000000
##337BB1	1.00	4.56	4.61	4.61
#FFFFFF	4.56	1.00	21.00	21.00
#000000	4.61	21.00	1.00	1.00
##000000	4.61	21.00	1.00	1.00

Color blindness preview

Protanopia (red-blind)

#637CB3

Deuteranopia (green-blind)

#5170B0

Tritanopia (blue-blind)

#00888E

Achromatopsia (no color)

#767676

Design tokens & code

CSS

--color: #337bb1;
/* rgb */ color: rgb(51, 123, 177);
/* oklch */ color: oklch(56.3% 0.110 244.4);

Tailwind

colors: {
  custom: {
    50: '#7aa1c8',
    500: '#337bb1',
    950: '#000000',
  },
}

SCSS

$custom: #337bb1;
$custom-light: #7aa1c8;
$custom-dark: #000000;

JSON

{
  "hex": "#337bb1",
  "rgb": {
    "r": 51,
    "g": 123,
    "b": 177
  },
  "hsl": {
    "h": 205.714,
    "s": 55.263,
    "l": 44.706
  },
  "oklch": {
    "l": 0.56258,
    "c": 0.11004,
    "h": 244.4
  },
  "luminance": 0.18044
}

Semantic roles & 50–950 ramp

primary

#337BB1

secondary

#C59B7B

accent

#8949DF

background

#F8F9FC

surface

#EFF2F8

border

#CACCD1

text

#0A0E13

muted

#7C7E82

Preview Lab

Preview with #337BB1

Body copy rendered with the generated semantic roles for this colour.

Preview Lab → · Contrast checker → · Palette generator →